After renaming bin/subiquity to bin/subiquity-tui we broke a
few things that invoked subiquity via bin/subiquity which is
now bin/subiquity-tui
Signed-off-by: Ryan Harper <ryan.harper@canonical.com>
Instead of tracking many directories, we'll use only one
overlay directory to hold any scripts or change we want to
see applied over the base image.
Signed-off-by: Ryan Harper <ryan.harper@canonical.com>